Aunt Lynn's Green Bean Casserole

I tested this on my family last Thanksgiving. They have requested it this year too. I got the base recipe from another website but added and deleted some of the ingredients to my taste. I like it because it's a bit different from the traditional casserole.

• Ready In: 45 mins
• Serves: 10

Ingredients

• 2  tablespoons butter
• 2  tablespoons all-purpose flour
• 1  teaspoon salt
• 1  teaspoon white sugar
• 1⁄4 cup onion, diced
• 1  cup sour cream
• 3 (14 1/2ounce) cans French style green beans, drained
• 2  cups  shredded cheddar cheese
• 1  can  French-fried onions (a.k.a fried onion crisps)
• 1  tablespoon butter, melted
• 1 (4 ounce) can  chopped water chestnuts
• 1⁄4 cup  chopped pecans
• 1 (4 ounce) can  chopped mushrooms

Directions

1. Preheat oven to 350 degrees (175 degrees C).
2. Melt 2 T butter in large skillet over medium heat.
3. Stir in flour until smooth and cook for one minute.
4. Stir in salt, sugar, onion, water chestnuts, pecans, mushrooms and sour cream.
5. Add green beans and stir until coated.
6. Transfer mixture to a 2 1/2 quart casserole dish.
7. Spread cheese over top.
8. In a small bowl toss taste toppers and butter and sprinkle over the cheese.
9. Bake for 30 minutes or until top is golden brown and cheese is bubbly.